Trojan – Start page

Two days ago my system got infected with StartPage.
I did the regit and msconfig thing thought I cleared it all out.
I then ran a symantic scan and it reported no virus found.
I am still getting popups like crazy and when I go to type a url in the address , it automatically puts a nkvd.us between the http:// and the www.
I am about to run a system recovery disc but that is another hell I’d hope to avoid.
Computer is a Medion – windows XP – intel 4 – most current yersion on Norton Anti Virus.
Thanks Ken Clark